   &  \multicolumn{2}{c}{ log(Wage) } &  \multicolumn{2}{c}{  log(Wage)} &  \multicolumn{2}{c}{  log(Wage)}   \\    
                    &\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}&\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}&\multicolumn{1}{c}{Est.}&\multicolumn{1}{c}{S.E.}\\
    &&\\ \hline  
log(Employment) (1845-1879)&       1.383&       0.323&            &            &            &            \\
\addlinespace
log(Employment) (1880-1913)&       1.034&       2.920&            &            &            &            \\
\addlinespace
log(Employment)     &            &            &       0.941&       0.310&     -10.123&       9.710\\
\addlinespace
Year                &            &            &       0.002&       0.007&            &            \\
\addlinespace
log(Employment)*Year&            &            &            &            &       0.006&       0.006\\
 Observations & \multicolumn{2}{c}{ 784} & \multicolumn{2}{c}{ 1990} & \multicolumn{2}{c}{ 1990}    \\  \hline  \\ &&      
